Open Windows Explorer by pressing Windows flag button + E (the button in between left Ctrl and Alt), or go to My Computer on the desktop.
Since I have no idea where you installed the game, and you neither, I suggest to right-click on My Computer and choose Search.
In the search fields you can specify your search, and type in a name or a wild card, etc.
I suspect you chose the standard path for the game to install, so there's a good chance it will be on C:\ .
Type in Medieval and wait for the search to finish. After a little while the folder should be found. Then just click and click until you get to it.
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